This file describes data collected in two simple experiments described
at some length in

  Schechter, Laura (2010) "The apple and your eye: Visual and taste
  rank-ordered probit analysis with correlated errors", Food Quality and
  Preference 21(1):112--120.

The file apples2.data reports data from an experiment in which 
individuals tried 5 different varieties of apples. 

The file delicious.data reports data from a second experiment which
only had people test 4 different types of Red Delicious Apples.

In both datasets each row is an observation. The first column is age
of the individual (which is 0 when missing). The second column is
gender (which is 0 when male, 1 when female, and 2 when missing). The
next 4 or 5 columns (depending on the data set) are the visual data,
while the final 4 or 5 columns (depending on the data set) are the
taste data.

For delicious, the numbers in the data for visual mean 1st apple, 2nd
apple etc. They do **not** mean first best, second best, etc. (So, a 3
in the first visual column means they ranked the third apple as the
best one.) On the other hand, the taste numbers are the ranking of the
1st apple, 3rd apple, 4th, and 2nd (in that order). (So, a 3 in the
first taste column means tney ranked the first apple as the third
best.) The apples are all red delicious: 1. Extra Large , 2. Organic
Small , 3. Small , and 4. Large.

For apple2, the numbers in the data for visual mean 1st apple, 2nd
apple etc. They do **not** mean first best, second best, etc. (So, a 3
in the first visual column means they ranked the third apple as the
best one.) On the other hand, the taste numbers are the ranking of the
4th apple, 1st, 2nd, 5th, and 3rd (in that order). (So, a 3 in the
first taste column means tney ranked the fourth apple as the third
best.) The apples are: 1. Granny Smith, 2. Fuji, 3. Golden Delicious,
4. Jonagold, and 5. Red Delicious.